R/C Tech Forums

Go Back   R/C Tech Forums > General Forums > Electric On-Road

Reply
 
Thread Tools Search this Thread
Old 03-03-2011, 08:00 AM   #1
Tech Elite
 
redron123's Avatar
 
Join Date: Oct 2008
Posts: 2,624
Trader Rating: 87 (99%+)
Default Someone with a Front ball diff on HPI sprint sport please help

I went to buy a front ball diff from hpi for my sprint2 sport and they were out of stock. I saw they had all the part to rebuild one so i called hpi and they said yes all of its there if you buy these three bags of parts. I got all the parts and tried looking at the instructions online and it seems they dont match up. I am pretty mechanical and i have tried putting it together several different ways. It just does not seem to perform they way it should. In the online instructions it shows a nut that is not there. On my diff one side is threaded inside. i suppose that is to do away with the nut but without updated instructions i dont know. If someone could get me instructions or draw me a picture at least explain what parts things go on what side like short and long and also in what order i would be most thankful.
__________________
check it out ----> www.ddatvinc.weebly.com D & D ATV PARTS INC.
redron123 is offline   Reply With Quote
Old 03-03-2011, 06:35 PM   #2
Tech Elite
 
redron123's Avatar
 
Join Date: Oct 2008
Posts: 2,624
Trader Rating: 87 (99%+)
Default

anyone?
__________________
check it out ----> www.ddatvinc.weebly.com D & D ATV PARTS INC.
redron123 is offline   Reply With Quote
Old 03-03-2011, 06:52 PM   #3
Tech Addict
 
mattleegee's Avatar
 
Join Date: Sep 2010
Location: Kent, WA
Posts: 646
Trader Rating: 9 (100%+)
Default

are you replacing a ball diff? (as in can you take your old apart and learn from that?)

wish i could help, you should post pics of what you got
__________________
AE ft b4.1 Ballistic 13.5 + SXX comp v2 (3-5-3-8) 1258tg
AE ft b4.1 Ballistic 17.5 + SXX comp v2 (3-7-0-4) 1257tg
BRCR
I pick things up and put them down
mattleegee is offline   Reply With Quote
Old 03-04-2011, 04:56 AM   #4
Tech Champion
 
tc3team's Avatar
 
Join Date: Mar 2006
Location: UK
Posts: 6,151
Default

I used to have the HPI Pro 2, and that did not have any thread in the diff, and I would imagine the Sprint and the Pro share similar transmission layouts.

usually, you put the diff bolt through the thrust race, then the other end is held in by a a nut and I think a plastic sleeve which then stops the diff nut from turning inside the diff, or the diff outdrive had a recess in it which stopped the nut from turning - but I can't remember exactly, as I had the car in the 90's and then sold it.

Hopefully that is some help to you.
__________________
Fusion Hobbies / www.horshamrc.org

The wife stops me being sane and the r/c stops me from going insane....
tc3team is offline   Reply With Quote
Old 03-04-2011, 05:58 AM   #5
Tech Elite
 
redron123's Avatar
 
Join Date: Oct 2008
Posts: 2,624
Trader Rating: 87 (99%+)
Default

It is an hpi upgrade part for the sprint 2 sport. It is not the stock diff and i dont have the one im replacing to look at because its no the same. I am refering to the assembly of the diff itself. I am building it out of all the replacement parts because they were out of stock of the complete diffs.
__________________
check it out ----> www.ddatvinc.weebly.com D & D ATV PARTS INC.
redron123 is offline   Reply With Quote
Old 03-04-2011, 06:00 AM   #6
Tech Elite
 
redron123's Avatar
 
Join Date: Oct 2008
Posts: 2,624
Trader Rating: 87 (99%+)
Default

Quote:
Originally Posted by tc3team View Post
I used to have the HPI Pro 2, and that did not have any thread in the diff, and I would imagine the Sprint and the Pro share similar transmission layouts.

usually, you put the diff bolt through the thrust race, then the other end is held in by a a nut and I think a plastic sleeve which then stops the diff nut from turning inside the diff, or the diff outdrive had a recess in it which stopped the nut from turning - but I can't remember exactly, as I had the car in the 90's and then sold it.

Hopefully that is some help to you.
Yes exactly what the exploded view looks like online but this diff does not do that. I have been in contact with hpi and they are trying to get me a schematic.
__________________
check it out ----> www.ddatvinc.weebly.com D & D ATV PARTS INC.
redron123 is offline   Reply With Quote
Old 03-04-2011, 06:12 AM   #7
Tech Champion
 
tc3team's Avatar
 
Join Date: Mar 2006
Location: UK
Posts: 6,151
Default

Quote:
Originally Posted by redron123 View Post
Yes exactly what the exploded view looks like online but this diff does not do that. I have been in contact with hpi and they are trying to get me a schematic.
I forgot to mention the preload spring, but im sure you're aware of that too.

I think from memory 1) get your diff bolt, 2) then put the thrust race onto it, then slide through the diff assembly, then 4) the end nut and captive washer() hold it in place to the inside of where the driveshaft goes in - or it simply sits inside the differential outdrive to prevent it from spinning around.

The only other possability is that you have been supplied with the wrong parts...

That's all I can remember of it.
__________________
Fusion Hobbies / www.horshamrc.org

The wife stops me being sane and the r/c stops me from going insane....
tc3team is offline   Reply With Quote
Old 03-04-2011, 06:40 AM   #8
Tech Champion
 
tc3team's Avatar
 
Join Date: Mar 2006
Location: UK
Posts: 6,151
Default

Quote:
Originally Posted by redron123 View Post
Yes exactly what the exploded view looks like online but this diff does not do that. I have been in contact with hpi and they are trying to get me a schematic.
The only other possability is that you have the wrong parts in the bags

Hopefully their assistance will clear things up.
__________________
Fusion Hobbies / www.horshamrc.org

The wife stops me being sane and the r/c stops me from going insane....
tc3team is offline   Reply With Quote
Old 03-04-2011, 06:11 PM   #9
Tech Elite
 
redron123's Avatar
 
Join Date: Oct 2008
Posts: 2,624
Trader Rating: 87 (99%+)
Default

Quote:
Originally Posted by tc3team View Post
The only other possability is that you have the wrong parts in the bags

Hopefully their assistance will clear things up.
Right parts and no help from hpi.
__________________
check it out ----> www.ddatvinc.weebly.com D & D ATV PARTS INC.
redron123 is offline   Reply With Quote
Old 03-05-2011, 04:25 AM   #10
Tech Adept
 
Rockin Rich's Avatar
 
Join Date: Feb 2010
Location: CT
Posts: 123
Trader Rating: 1 (100%+)
Default

Assemble the diff as in the instructions, however the thrust screw will be held in the threaded side of the diff with no nut. Use blue locktite on the screw threads or it will loosen too quick and you will not be able to maintain diff settings, check diff frequently.
__________________
RC MADNESS
TEAM SCREAM
Rockin Rich is offline   Reply With Quote
Old 03-05-2011, 08:20 AM   #11
Tech Elite
 
redron123's Avatar
 
Join Date: Oct 2008
Posts: 2,624
Trader Rating: 87 (99%+)
Default

Quote:
Originally Posted by Rockin Rich View Post
Assemble the diff as in the instructions, however the thrust screw will be held in the threaded side of the diff with no nut. Use blue locktite on the screw threads or it will loosen too quick and you will not be able to maintain diff settings, check diff frequently.
Do the thrust washers and small balls go on long side and the spring under it? If so i have it put together this way and all it seems to do is tighten up when i turn the diff one way and loosen when i turn it the other way. I dont see how it will be tightened up enough so that the middle wont spin when ends are held per instructions but if you turn one side of diff the other side shoud spin the oposite direction with it this tight.
__________________
check it out ----> www.ddatvinc.weebly.com D & D ATV PARTS INC.
redron123 is offline   Reply With Quote
Old 03-05-2011, 01:45 PM   #12
Tech Adept
 
Rockin Rich's Avatar
 
Join Date: Feb 2010
Location: CT
Posts: 123
Trader Rating: 1 (100%+)
Default

I think from the inside it should be washer-spring-washer-diff balls-washer- screw head, and yes in the long side. And do not forget to use grease, like Asso. Black or some other type on the diff ball and washers.
__________________
RC MADNESS
TEAM SCREAM
Rockin Rich is offline   Reply With Quote
Old 03-06-2011, 09:52 PM   #13
Tech Elite
 
redron123's Avatar
 
Join Date: Oct 2008
Posts: 2,624
Trader Rating: 87 (99%+)
Default

Quote:
Originally Posted by Rockin Rich View Post
I think from the inside it should be washer-spring-washer-diff balls-washer- screw head, and yes in the long side. And do not forget to use grease, like Asso. Black or some other type on the diff ball and washers.
There is only two washers and in the original pic it shows balls in between the two thrust wasshers.I have right now from the inside on the long side spring-washer-balls-washer.
__________________
check it out ----> www.ddatvinc.weebly.com D & D ATV PARTS INC.
redron123 is offline   Reply With Quote
Old 03-07-2011, 04:07 AM   #14
Tech Adept
 
Rockin Rich's Avatar
 
Join Date: Feb 2010
Location: CT
Posts: 123
Trader Rating: 1 (100%+)
Default

Quote:
Originally Posted by redron123 View Post
There is only two washers and in the original pic it shows balls in between the two thrust wasshers.I have right now from the inside on the long side spring-washer-balls-washer.
Sounds right.
__________________
RC MADNESS
TEAM SCREAM
Rockin Rich is offline   Reply With Quote
Old 03-07-2011, 07:40 AM   #15
Tech Elite
 
redron123's Avatar
 
Join Date: Oct 2008
Posts: 2,624
Trader Rating: 87 (99%+)
Default

Quote:
Originally Posted by Rockin Rich View Post
Sounds right.
and it looks right but when you tighten it so when the ends are held and the middle wont spin then you cant turn one side and the other spins the other direction. If you loosen it up until it does when you spin it one way it tightens and the other it loosens.Nothing really holding it.
__________________
check it out ----> www.ddatvinc.weebly.com D & D ATV PARTS INC.
redron123 is offline   Reply With Quote
Reply



Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)
 
Thread Tools Search this Thread
Search this Thread:

Advanced Search

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are On
Pingbacks are On
Refbacks are Off



All times are GMT -7. It is currently 10:23 PM.


We are a participant in the Amazon Services LLC Associates Program, an affiliate advertising program designed to provide a means for us to earn fees by linking to Amazon.com and affiliated sites.
Powered By: vBulletin v3.9.2.1
Privacy Policy | Terms of Use | Advertise Content © 2001-2011 RCTech.net